Fossil ID?

[gorgon]

Found on the shore of Grand Traverse Bay, East Arm, @ 45th parralel.

[Kane]

Worn crinoid cross section.

[Rockwood]

1 hour ago, Kane said:

Worn crinoid cross section.

Wouldn't that technically be a longitudinal section ?

[Kane]

6 minutes ago, Rockwood said:

Wouldn't that technically be a longitudinal section ?

Yes

[abyssunder]

I agree with the crinoid ID. It's a curved crinoid stem in a cobble, revealing how it looks when the central columnals are more weathered (polished) than the lateral ones.

 

[Bobby Rico]

Yes crinoid 

[Rockwood]

9 minutes ago, abyssunder said:

central columnals are more weathered (polished) than the lateral ones.

Could this be worded as centrally sectioned, and laterally sectioned ?

Or is does this refer to a concept you can explain ? 

[abyssunder]

It depends on how you consider. I like to use "sectioned" when it's made by humans, and "weathered' when it is made by Mother Nature, although the latter can make sections / splits with or without weathering the surface, but you have to find them in the right time.

 

I just wanted to show how relative might be a curvature of a "tubular" object to a weathering surface or a cut (section).

If the partial column preserved in the matrix is straight, after the weathering of the matrix to form of cobble might show the opposite of what we are seeing in the OP's specimen (with a more pronounced worn on the lateral extremities). That's what lead me to think that the partial column is curved in the the matrix.

[Fossildude19]

6 hours ago, Rockwood said:

Wouldn't that technically be a longitudinal section ?

Depends on which way you hold it.  

[Rockwood]

10 hours ago, abyssunder said:

That's what lead me to think that the partial column is curved in the the matrix.

I think you may be right about this.

[Rockwood]

8 hours ago, Fossildude19 said:

Depends on which way you hold it.  

Na ah. Matters which is longer.